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Retarding Phase Segregation via Lattice Reinforcement for Efficient and Stable Perovskite/Organic Tandems
Pengpeng Dong1, Zhichao Zhang1, Weijie Chen1
1Laboratory of Advanced Optoelectronic Materials, Suzhou Key Laboratory of Novel Semiconductor-optoelectronics Materials and Devices, State Key Laboratory of Bioinspired Interfacial Materials Science, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, China.
Dimethylammonium ion incorporation enhances perovskite/organic tandem solar cell stability. This strategy suppresses phase segregation, improving operational longevity and high power conversion efficiencies.
Area of Science:
- Materials Science
- Renewable Energy
- Solid-State Physics
Background:
- Perovskite/organic tandem solar cells face stability challenges under operational conditions, including light irradiation and high bias voltage.
- Light-induced halide phase segregation in perovskite subcells is a major degradation pathway, worsened by electron-phonon coupling under bias.
- Existing single-junction solar cells are less susceptible to these operational stresses.
Purpose of the Study:
- To enhance the operational stability of perovskite/organic tandem solar cells.
- To mitigate halide phase segregation and ion migration under light irradiation and high bias voltage.
- To improve the power conversion efficiency and long-term performance of tandem solar cells.
Main Methods:
- Incorporation of dimethylammonium ion (DMA+) into the perovskite lattice.
- Formation of an intermediate phase to delay crystallization and enhance crystallinity.
- Analysis of lattice structure changes, including [PbX6]4- octahedral tilting and bond lengths.
- Suppression of halide escaping and ion migration through lattice reinforcement.
- Measurement of quasi-Fermi-level splitting, open-circuit voltage, and power conversion efficiency.
Main Results:
- DMA+ incorporation delays crystallization, enhances crystallinity, and reduces lattice defects.
- DMA+ enlarges the bandgap, shortens Pb-I bonds, and reinforces the perovskite lattice.
- Halide segregation and ion migration are significantly suppressed under operational stress.
- Stable quasi-Fermi-level splitting and a high open-circuit voltage of 1.34 V were achieved.
- Perovskite/organic tandems demonstrated high efficiencies (26.15% and 24.87%) and excellent operational stability (T90 ~ 1350 h).
Conclusions:
- DMA+ incorporation is a viable strategy to improve the stability of perovskite/organic tandem solar cells.
- The enhanced stability is attributed to suppressed phase segregation and improved lattice integrity.
- These findings pave the way for more durable and efficient perovskite-based photovoltaic devices.
